SU952813A1 - Concrete mix - Google Patents

Description

The invention relates to the construction and building materials industry and can be used for the manufacture of high-strength concrete products based on slag alkaline binder, which have special requirements for water resistance, durability and strength. Concrete mixtures are known, which include as a ground milled slag with a lime or gypsum activator l. The disadvantage of these concrete mixes is the relatively low strength of the concrete produced. Also known is a concrete mixture based on a slag-alkaline agent in the form of a milled granulated blast furnace slag, an alkaline activator in the form of a salt of weak acids and alkali metals, and a filler 2j. The disadvantage of this concrete mix is the short time it takes to set the tackle, which creates technological difficulties when using this tamper in monolithic concrete technology and in concrete goods plants currently operating. Closest to the invention is a concrete mix, including ground blast putty, carbonate aggregate 55-65%, alkaline water 7-9%, water glass 3-6% and. The disadvantage of this slag-concrete concrete mixture is a short setting time, relatively low strength and water resistance. The purpose of the invention 7 is a prolongation of the setting time, an increase in strength and water resistance. The goal is achieved by the fact that the concrete mixture comprising ground blast furnace slag, carbonate filler, soluble glass, additive and water contains brompex and additionally hydrogen peroxide and silica dust as an additive in the following ratio, wt.%: Ground blast-furnace slag 17-24 Carbonate aggregate 55-75 Soluble glass 5.1-7.2. Chrome-peak0.002-0.01 Hydrogen peroxide 0.15-0.40 Silicon dust O, 3-0.8 Water Others The chemical composition of silica dust is a by-product of silicon production %: SiO 85-95; C 3-10;

AljOj 0.3-1.0; RedO, 0.1-1.0; CaO. 0.3-1.0; MgO 0.1-0.3%.

The granulometric composition of siliceous dust is a by-product of silicon production - particle content Less than 3 microns 65-70%, 3-20 microns 10-12%, 20-50 microns 10-15%, more than 50 MKMI 10-15%.

The setting time is extended by using in the proposed composition hydrogen peroxide and silica dust, forming compounds in an alkaline solution, which have a lower chemical reaction rate with blast furnace minerals,

. In addition, the introduction of a chrompeak into a pre-laid concrete mix provides a significant lengthening of the setting time and an increase in compressive strength.

Combined use of hydrogen peroxide, silica dust and chromic oxide in slag alkaline concrete

6 provides a structure characterized by high strength and water resistance.

. The increase in workability is also due to the joint use of chromicum, silica dust, a by-product of silicon production, containing fine silica and hydrogen peroxide in the slag-alkaline betbn mixture.

The ratio of the components in the concrete mixture is selected taking into account the production of the workability of the mixture (sediment of the standard cone) OK-1 with

The setting time is determined according to GOST 310.1-76, the ultimate tensile strength is 1; it is defined for compression according to GOST 10180-76, the water tightness according to GOST 4800-59.

The compositions of the proposed concrete mix (compositions 1-3) and known (composition 4) and the results of its tests, as well as the physico-mechanical properties of concrete are given in the tables

Ground granulated domain donkey of Novo-Tula Metallurgical Plant17.0 Silicon Sodium M 1.0 (soluble glass) 5.1 Synthetic alkaline melt Chrompik0, 002 0 Hydrogen peroxide 0.15 Silica-containing dust - a by-product of silicon production 0.8 Water1.948 carbonate crushed stone49.0 .. Sand limestone 26.00 22 Setting time, h-min: beginning 2-15 end 4-00 Compressive strength.

The table shows that the concrete is our water content, and also the substantive basis of the proposed concrete mixture is more prolonged for the time being; o compared to the known, it has the same setting time, increased workability with less durability and water resistance. 21.0 24.0 24.0 6.3 7.2 2.0 -. - 3.0, 007 0.01 0.25 0.40 O, 5 0.3 4.2 13.09 10.0 45.2 38.00 10.7 g, 543 17.00 20.3 2- 30 2-19 1-30 4-20 5-15 2-00

Claims (3)

1.Volzhansky A.V. and others. Concretes and products from slag and ash materials. M., stroiizdat, 1969. 2. Glukhovsky VD, Groutosilicates. Kiev, Gosstroyizdat USSR, 1959, p. 45-68. 3. Author's certificate of the USSR 583106, cl. From 04 to 7/20, 1976.